feat(tapo-agent): add schedule/countdown timer API support

- Fork tapo crate to add missing schedule/timer APIs
- Add get_countdown_rules, get_schedule_rules, get_next_event methods
- New readings: countdown_active, countdown_remain, schedule_count,
  schedule_active_count, next_event_time
- Add local compilation to build script alongside cross-compilation
- Implement offline polling - device collection continues when server disconnects
- Add more device readings: on_time, signal_level, rssi, runtime_today/month, energy_month

Vendored tapo fork in tapo-fork/ with minimal changes to add schedule APIs.

agents/tapo/tapo-fork/tapo-py/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "tapo-py"
+version = "0.1.0"
+edition = "2024"
+rust-version = "1.88"
+publish = false
+
+[lib]
+name = "tapo"
+crate-type = ["cdylib"]
+doc = false
+
+[features]
+default = []
+
+[dependencies]
+anyhow = { workspace = true }
+chrono = { workspace = true }
+log = { workspace = true }
+pyo3 = { workspace = true, features = [
+    "chrono",
+    "experimental-async",
+    "extension-module",
+    "py-clone",
+] }
+pyo3-async-runtimes = { version = "0.27", features = ["attributes", "tokio-runtime"] }
+pyo3-log = { version = "0.13" }
+serde = { workspace = true }
+serde_json = { workspace = true }
+tokio = { workspace = true, features = ["rt-multi-thread", "sync"] }
+
+tapo = { path = "../tapo", features = ["python"] }